The others are spot on, I would do everything they said if I were you, but I just thought I would add a couple of other suggestions. Have you had your thyroid checked? Not by an ignorant normal doctor, but by someone with a speacialisation in this area (though not necessarily a "specialist doctor")?
Another suggestion is to use MH's Lower Bowel Balance formula, its great!!! Its not a laxative as such (not harsh at all) and helps you go for sure every day, two or three times. It will also help improve rather than damage your bowel tone. If you can't get that, Arise & Shine do a great product called "Chomper", almost as good as MH's product in my experience, or maybe as good! These things will definitely help, and if you do have thyroid problem, working on that will help a lot too. My bowels are the first to respond to a lack of thyroid hormone in my body.